Mixed mode broadcast/multicast communication

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine that a negative acknowledgment (NACK) feedback message for a broadcast/multicast communication is to be transmitted. The UE may transmit the NACK feedback message, via a radio access network (RAN), to a broadcast/multicast control plane function device of a core network based at least in part on determining that the NACK feedback message is to be transmitted. The UE may receive a retransmission of the broadcast/multicast communication based at least in part on transmitting the NACK feedback message.

What is claimed is: 
     
       1. A method of wireless communication performed by a user equipment (UE), comprising:
 transmitting a negative acknowledgment (NACK) feedback message for a broadcast/multicast communication, via a radio access network (RAN), to a broadcast/multicast control plane function device of a core network that provides broadcast/multicast retransmission management for the core network, performs broadcast/multicast security functions for the core network, provides broadcast/multicast service announcements for the core network, performs broadcast/multicast session control for the core network, or a combination thereof; and 
 receiving a unicast retransmission of the broadcast/multicast communication based at least in part on transmitting the NACK feedback message. 
 
     
     
       2. The method of  claim 1 , wherein the unicast retransmission is based at least in part on a quantity of NACK feedback messages for the broadcast/multicast communication, transmitted by a plurality of UEs that includes the UE, not satisfying a threshold value. 
     
     
       3. The method of  claim 1 , wherein the unicast retransmission is received, via the RAN, from a user plane function (UPF) device of the core network. 
     
     
       4. The method of  claim 3 , wherein the UPF device is in communication, via a user plane interface, with a broadcast/multicast function device of the core network, and wherein the broadcast/multicast function device is in communication, via a control plane interface, with a session management function device of the core network and in communication with a content server outside of the core network. 
     
     
       5. The method of  claim 1 , wherein the broadcast/multicast control plane function device is a broadcast/multicast coordination function device or an access and mobility management function device of the core network. 
     
     
       6. The method of  claim 1 , wherein the unicast retransmission is received, via the RAN, from a broadcast/multicast user plane function device of the core network. 
     
     
       7. The method of  claim 6 , wherein the broadcast/multicast user plane function device is in communication, via a control plane interface, with the broadcast/multicast control plane function device and in communication with a content server outside of the core network. 
     
     
       8. The method of  claim 1 , wherein the broadcast/multicast control plane function device is in communication with a mobility management function device that provides control plane termination at the RAN. 
     
     
       9. The method of  claim 1 , wherein the unicast retransmission is from a content server outside of the core network. 
     
     
       10. The method of  claim 1 , wherein the broadcast/multicast communication is encrypted according to a tunneling protocol. 
     
     
       11. The method of  claim 1 , wherein the broadcast/multicast communication includes one or more layer coding transport (LCT) layers, and the NACK feedback message relates to a particular layer of the LCT layers. 
     
     
       12. A method of wireless communication performed by a device of a core network, comprising:
 receiving, using a broadcast/multicast control plane function, a negative acknowledgment (NACK) feedback message for a broadcast/multicast communication transmitted to a user equipment (UE), wherein the broadcast/multicast control plane function provides broadcast/multicast retransmission management for the core network, performs broadcast/multicast security functions for the core network, provides broadcast/multicast service announcements for the core network, performs broadcast/multicast session control for the core network, or a combination thereof; and 
 causing a unicast retransmission of the broadcast/multicast communication based at least in part on receiving the NACK feedback message. 
 
     
     
       13. The method of  claim 12 , wherein the unicast retransmission is based at least in part on a determination that a quantity of NACK feedback messages received for the broadcast/multicast communication, from a plurality of UEs that includes the UE, does not satisfy a threshold value. 
     
     
       14. The method of  claim 12 , wherein causing the unicast retransmission causes a user plane function (UPF) device of the core network to transmit the unicast retransmission. 
     
     
       15. The method of  claim 14 , wherein the UPF device is in communication, via a user plane interface, with a broadcast/multicast function device of the core network, and wherein the broadcast/multicast function device is in communication, via a control plane interface, with a session management function device of the core network and in communication with a content server outside of the core network. 
     
     
       16. The method of  claim 12 , wherein the device is a broadcast/multicast coordination function device or an access and mobility management function device of the core network. 
     
     
       17. The method of  claim 12 , wherein causing the unicast retransmission causes a broadcast/multicast user plane function device of the core network to transmit the unicast retransmission. 
     
     
       18. The method of  claim 17 , wherein the broadcast/multicast user plane function device is in communication, via a control plane interface, with the broadcast/multicast control plane function of the device and in communication with a content server outside of the core network. 
     
     
       19. The method of  claim 12 , wherein the broadcast/multicast control plane function of the device is in communication with a mobility management function device that provides control plane termination at a radio access network. 
     
     
       20. The method of  claim 12 , wherein the unicast retransmission is from a content server outside of the core network. 
     
     
       21. The method of  claim 12 , wherein the broadcast/multicast communication is encrypted according to a tunneling protocol. 
     
     
       22. The method of  claim 12 , wherein the broadcast/multicast communication includes one or more layer coding transport (LCT) layers, and the NACK feedback message relates to a particular layer of the LCT layers. 
     
     
       23. A user equipment (UE) for wireless communication, comprising:
 at least one memory; and 
 at least one processor communicatively coupled with the at least one memory, the at least one processor configured to cause the UE to:
 transmit a negative acknowledgment (NACK) feedback message for a broadcast/multicast communication, via a radio access network (RAN), to a broadcast/multicast control plane function device of a core network that provides broadcast/multicast retransmission management for the core network, performs broadcast/multicast security functions for the core network, provides broadcast/multicast service announcements for the core network, performs broadcast/multicast session control for the core network, or a combination thereof; and 
 receive a unicast retransmission of the broadcast/multicast communication based at least in part on transmitting the NACK feedback message. 
 
 
     
     
       24. The UE of  claim 23 , wherein the unicast retransmission is based at least in part on a quantity of NACK feedback messages for the broadcast/multicast communication, transmitted by a plurality of UEs that includes the UE, not satisfying a threshold value. 
     
     
       25. The UE of  claim 23 , wherein the broadcast/multicast control plane function device is a broadcast/multicast coordination function device or an access and mobility management function device of the core network. 
     
     
       26. The UE of  claim 23 , wherein the at least one processor, to cause the UE to receive the unicast retransmission, is configured to cause the UE to receive the unicast retransmission, via the RAN, from a broadcast/multicast user plane function device of the core network. 
     
     
       27. A device of a core network for wireless communication, comprising:
 at least one memory; and 
 at least one processor communicatively coupled with the at least one memory, the at least one processor configured to cause the device to:
 receive, using a broadcast/multicast control plane function, a negative acknowledgment (NACK) feedback message for a broadcast/multicast communication transmitted to a user equipment (UE), wherein the broadcast/multicast control plane function provides broadcast/multicast retransmission management for the core network, performs broadcast/multicast security functions for the core network, provides broadcast/multicast service announcements for the core network, performs broadcast/multicast session control for the core network, or a combination thereof; and 
 cause a unicast retransmission of the broadcast/multicast communication based at least in part on receiving the NACK feedback message. 
 
 
     
     
       28. The device of  claim 27 , wherein the unicast retransmission is based at least in part on a determination that a quantity of NACK feedback messages received for the broadcast/multicast communication, from a plurality of UEs that includes the UE, does not satisfy a threshold value. 
     
     
       29. The device of  claim 27 , wherein the device is a broadcast/multicast coordination function device or an access and mobility management function device of the core network. 
     
     
       30. The device of  claim 27 , wherein the at least one processor, to cause the device to cause the unicast retransmission, is configured to cause the device to cause a broadcast/multicast user plane function device of the core network to transmit the unicast retransmission.